JPH11198584A - Chuck type tip mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck type tip mechanical pencil wherein a barrel does not become thick, and there is no fear that the appearance may be spoiled, and at the same time, which can be constituted into an easily grippable shape. SOLUTION: For this chuck type tip mechanical pencil comprising a tip chuck 4 to hold a lead 13, and a feeding chuck 5 which is located on the rear side than the tip chuck 4 in the longitudinal direction and feeds the lead 13 by advancing, an internal cylinder 3 is fixed to a rear part of the tip chuck 4. in a fixing hole 3A which is formed on the peripheral wall of the internal cylinder 3, an engaging piece 10 is press-fitted and fixed, and a leg part 10A which is formed on the engaging piece 10 protrudes inside from the internal surface 3B of the internal hole. In addition, a clamping utensil 6 which is fitted on the head part 5A of the feeding chuck 5, is loosely fitted between the leg part 10A of the engaging piece 10 and an engaging step 3C of the internal cylinder 3. A rear spring 11 is bridged between the rear end of the internal cylinder 3 and the outer step 7A of a lead tank 7 which is fixed to a rear part of the feeding chuck 5, and by the rear spring 11, the feeding chuck 5 is urged backward in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical chuck having a tip chuck for holding a lead, and a tip chuck type pencil provided with a feeding chuck for fitting a fastening ring to the head and feeding the lead by a predetermined amount.

[0002]

2. Description of the Related Art Conventionally, as a tip chuck type mechanical pencil capable of writing even with a shortened core, as shown in FIG. 9, an inner cylinder 203 is press-fitted and fixed to a tip chuck 4, and is provided inside the inner cylinder 203. The locking piece 210 was engaged and attached. The fastener 106 that is externally fitted to the feeding chuck 5 is loosely fitted between the locking piece 210 and the locking step 203C of the inner cylinder 203. Further, there is known a tip chuck type mechanical pencil in which a rear spring 111 is stretched between the locking piece 210 and the core tank 207 in the inner cylinder 203 to urge the feeding chuck 5 rearward in the longitudinal direction.

[0003]

However, in the tip chuck type mechanical pencil shown in FIG. 9, the locking piece 210 is engaged with the inside of the inner cylinder 203 and is attached. In order to position the spring 111 inside the inner cylinder 203 after being stretched between
When the inner diameter of the inner cylinder 203 was made of synthetic resin, the outer diameter became particularly large, which was not feasible. SUMMARY OF THE INVENTION An object of the present invention is to provide a tip chuck mechanical pencil that solves the above-mentioned problems.

[0004]

To achieve the above object, the present invention provides a shaft cylinder, a base provided at a front portion of the shaft cylinder,
A tip chuck that is built into the base and is urged rearward in the longitudinal direction to hold the lead, and a tip chuck that is located rearward in the longitudinal direction of the tip chuck and that feeds out the lead by moving forward. It is related to a mechanical pencil. In addition, the inner cylinder is fixed to the rear portion of the tip chuck, and a fixing hole is formed in the peripheral wall of the inner cylinder. A locking piece is press-fitted and fixed to the fixing hole of the inner cylinder, and a foot formed on the locking piece is projected inward from the inner surface of the inner hole of the inner cylinder. A fastener externally fitted to the head of the feeding chuck is loosely fitted between the foot of the locking piece and the locking step of the inner cylinder. Further, a rear spring is stretched between the rear end of the inner cylinder and the outer stage of the core tank fixed to the rear of the feed chuck, and the feed spring is urged rearward in the longitudinal direction by the rear spring, so that a tip chuck type is provided. A mechanical pencil is constructed.

[0005]

FIG. 1, FIG. 2 and FIG. 3 show a first embodiment of the present invention, in which a sliding groove 1A extending in the longitudinal direction is vertically opposed to a rear portion of a synthetic resin base 1 so as to face each other. Formed. A metal tip fastener 2 is fixed to the tip opening of the base 1. A fixing hole 3A is formed on the peripheral wall of the inner cylinder 3 so as to face vertically, and a rear part of the tip chuck 4 made of a metal such as brass is fixed to a front part of the inner cylinder 3. A fastener 6 is externally fitted to the head 5A of the feeding chuck 5, and a core tank 7 is fixed to a rear portion of the feeding chuck 5. An outer step 7A composed of an outer flange is formed at the front part of the core tank 7, and elastic pieces 7C are formed vertically at the rear thereof by two notched grooves 7B extending in the longitudinal direction. A projection 7D is formed on the substrate.

Further, an eraser 8 is provided inside the rear part of the core tank 7, and a knob 9 for covering the eraser 8 is fitted to the rear outside of the core tank 7. As shown in FIG. 2, a locking piece 10 is press-fitted and fixed in the fixing hole 3A of the inner cylinder 3, and the foot 10A of the locking piece 10 projects inward from the inner surface 3B of the inner hole of the inner cylinder 3. Is done. Rear end of inner cylinder 3 and outer stage 7 of core tank 7
A rear spring 11 is stretched between A, and the head 5A of the feeding chuck 5 is pressed by the fastener 6. The fastener 6 is loosely fitted slidably between the locking step 3C of the inner cylinder 3 and the locking piece 10, and is normally pressed by the locking piece 10.

An inner cylinder 3 having a feed chuck 5, a fastener 6, and the like and having a tip chuck 4 fixed to the front portion is inserted from the rear end of the base 1, and a head 4A of the tip chuck 4 is attached to the tip fastener. 2 and project from the tip. Also, the core tank 7
When the elastic piece 7C of the core tank 7 bends,
D is fitted into the sliding groove 1A of the base 1, and the core tank 7 is configured to be slidable in the longitudinal direction with respect to the base 1, but not to rotate, and that the core tank 7 comes off from the base 1. To prevent

A front spring 12 is stretched between an inner stage 1 B of the base 1 and an outer stage 3 D of the inner cylinder 3.
2, the tip chuck 4 is urged rearward in the longitudinal direction. Therefore, when the lead 13 is inserted into the tip chuck 4, the head 4 </ b> A of the tip chuck 4 is pressed and closed by the tip fastener 2, and the lead 13 is firmly held. A barrel 14 is screwed into the rear part of the base 1, and the knob 9 protrudes from the rear end of the barrel 14 as appropriate.

FIGS. 4, 5 and 6 show a second embodiment of the present invention, in which sliding grooves 101A extending in the longitudinal direction are formed on the rear portion of a synthetic resin base 101 so as to face each other. . Further, a metal tip fastener 2 is fixed to the tip opening of the base 101. Further, fixing holes 103A opposed to each other are formed at upper and lower positions on the peripheral wall of the inner cylinder 103 made of synthetic resin, and a concave portion 103E is formed on an upper half of the peripheral wall. A rear part of the tip chuck 4 made of metal such as brass is fixed to a front part of the inner cylinder 103. A fastener 6 is externally fitted to the head 5A of the feeding chuck 5, and the feeding chuck 5
The core tank 107 is fixed to the rear part.

At the front of the core tank 107, two notches 107B extending in the longitudinal direction are used to form an elastic piece 107C vertically.
Are formed on each of the elastic pieces 107C.
D is formed. Further, an eraser 8 is provided inside the rear part of the core tank 107, and a knob 9 that covers the eraser 8 is fitted to the rear outside of the core tank 107.

As shown in FIGS. 7 and 8, the locking piece 110 is formed of a front part 110B having a disc-shaped lower part partially cut away and a semicylindrical rear part 110C. The front portion 110B of the locking piece 110 is fixed to the fixing hole 10 of the inner cylinder 103.
3A and fixed to the front part 11 of the locking piece 110.
The foot 110A formed at 0B protrudes inward from the inner surface 103B of the inner hole of the inner cylinder 103. Furthermore, locking piece 1
The rear part 110C of 10 is fitted into the concave part 103E of the inner cylinder 103. The rear end of the inner cylinder 103 and the projection 10 of the core tank 107
The rear spring 11 is stretched between 7D and the head 5A of the feeding chuck 5 is pressed by the fastener 6. Fastener 6 is inner cylinder 1
03 is slidably fitted between the locking step 103C and the locking piece 110, and is normally pressed by the locking piece 110. An inner cylinder 103 having a feed chuck 5, a fastener 6, and the like and having the tip chuck 4 fixed to the front portion is inserted from the rear end of the base 101, and the head 4A of the tip chuck 4 passes through the tip fastener 2. And protrude from the tip. When the elastic piece 107C of the core tank 107 bends, the protrusion 107D of the core tank 107 is fitted into the sliding groove 101A of the base 101, and the core tank 107 can slide in the longitudinal direction with respect to the base 101. Are prevented from rotating, and prevent the lead tank 107 from coming off the base 101.

A front spring 12 is stretched between an inner stage 101B of the base 101 and an outer stage 103D of the inner cylinder 103,
The front spring 12 urges the tip chuck 4 rearward in the longitudinal direction. Therefore, the core 13 is provided in the tip chuck 4.
Is inserted, the head 4A of the tip chuck 4 is pressed and closed by the tip fastener 2, and the core 13 is firmly held. A shaft cylinder 14 is screwed into the rear part of the base 101,
The knob 9 protrudes from the rear end of 4 as appropriate.

In the tip chuck type mechanical pencil according to the second embodiment, since the semi-cylindrical rear portion 110C of the locking piece 110 is fitted into the concave portion 103E of the inner cylinder 103, the locking piece 110 does not incline. The advantage of being press-fitted and fixed to 103 is obtained.

In each of the above embodiments, the rotation of the feeding chuck is prevented by the sliding groove of the base and the projection of the core tank, so that even if a force in the rotational direction is applied to the knob or the core tank, the core is rotated. There is no danger that the tank will rotate, and it is possible to prevent the bending of the core caused by the rotation of the feeding chuck. In addition, the productivity is good, the number of parts is small, and the device can be manufactured at low cost.

[0015]

The tip chuck type mechanical pencil of the present invention described above has a locking piece press-fitted and fixed in a fixing hole formed in the peripheral wall of the inner cylinder, and a rear end of the locking piece and an outer step of the core tank. Since the rear spring is stretched between them, the inner cylinder can be configured to have a small diameter, and as a result, the shaft cylinder becomes thicker. It is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a mechanical pencil with a tip chuck according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view showing a tip chuck type mechanical pencil according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view taken along line AA of FIG. 4;

FIG. 6 is an enlarged sectional view taken along line BB of FIG. 4;

FIG. 7 is an enlarged sectional view showing a locking piece according to a second embodiment.

FIG. 8 is an enlarged right side view showing a locking piece according to a second embodiment.

FIG. 9 is a sectional view showing a conventional tip chuck mechanical pencil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 1A Sliding groove of base 1 3 Inner cylinder 3A Fixing hole of inner cylinder 3 3B Inner hole inner surface of inner cylinder 3 C Locking step of inner cylinder 3 4 Tip chuck 5 Feeding chuck 5A Head of feeding chuck 5 6 Tightening Tool 7 Core tank 7A Outer stage of core tank 7 7D Projection of core tank 7 10 Locking piece 10A Foot of locking piece 10 Rear spring 13 Core 14 Shaft cylinder 101 Base 101A Sliding groove of base 101 103 Inner cylinder 103A Fixed hole 103B of inner cylinder 103B Inner hole inner surface of inner cylinder 103 103C Locking stage of inner cylinder 103 107 Core tank 107D Projection of core tank 107 110 Lock piece 110A Foot 111 of lock piece 110 Rear spring

Claims (2)

[Claims] 1. A barrel, a base provided at a front portion of the barrel, a tip chuck built in the base and urged rearward in the longitudinal direction to hold the lead, and a longitudinal direction from the tip chuck. A tip chuck type mechanical pencil, which is located rearward and includes a feed chuck for feeding out a lead by moving forward, has an inner cylinder fixed to the rear portion of the tip chuck and is engaged with a fixing hole formed in a peripheral wall of the inner cylinder. Pressing and fixing the stop piece,
A foot formed on the locking piece protrudes inward from the inner surface of the inner hole of the inner cylinder, and a fastener externally fitted to the head of the feeding chuck forms a locking step between the foot of the locking piece and the inner cylinder. A rear spring is stretched between a rear end of the inner cylinder and an outer stage of a core tank fixed to a rear portion of the delivery chuck, and the delivery spring is moved in the longitudinal direction by the rear spring. Tip-tip mechanical pencil characterized by being biased rearward. 2. A sliding groove extending in a longitudinal direction is formed at a rear portion of the base, and a protrusion formed on a core tank is fitted into the sliding groove, and the core tank can slide in the longitudinal direction with respect to the base. 2. A mechanical pencil according to claim 1, wherein said mechanical pencil is not rotatable.